fn main() {
    println!("Hello, world!");
    let an_integer = 1u32;
    let a_boolean = true;
    let unit = ();
    let copied_integer = an_integer;
    println!("An integer: {:?}", copied_integer);
    println!("A boolean: {:?}", a_boolean);
    println!("Meet the most value: {:?}", unit);
    let _unused_variable = 3u32;
    let _noisy_unused_variable = 2u32;
}
